| 摘要 |
A programmable interface. The inventive interface is designed to be used with an interface controller and includes a first circuit for selecting one or more components from a plurality of components in response to at least one first control signal. A second circuit selectively connects the components in response to at least one second control signal. A third circuit selects a serial output mode or a parallel output mode of said components in response to at least one third control signal. In an illustrative implementation, the inventive interface is used as part of an IEEE 1149.1 bus architecture and includes a plurality of stages. At least one of the stages is associated with each of the components under test and includes circuitry for selecting an associated component. The second circuit includes circuitry within each stage for selectively connecting an associated component to a second component by outputting the output of an associated component or the output a previous stage as the output of the stage. The third circuit includes circuitry disposed within each stage for selecting between a serial or parallel mode of operation by outputting the output of a previous stage or a test data output from a bus controller as the test data output from the stage. The first, second and third control signals are provided by the interface controller. The inventive interface thereby provides a system and technique for conducting tests of components in an 1149.1 environment on a single ring so that standard COTS test generation tools can be used, while also allowing run-based commands to be executing on some components while at the same time communicating with other components.
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